Foil, n. [OE. foil leaf, OF. foil, fuil, fueil, foille, fueille, F. feuille, fr. L. folium, pl. folia; akin to Gr. , and perh. to E. blade. Cf. Foliage, Folio.] 1. A leaf or very thin sheet of metal; as, brass foil; tin foil; gold foil.
(Jewelry) A thin leaf of sheet copper silvered and burnished, and afterwards coated with transparent colors mixed with isinglass; -- employed by jewelers to give color or brilliancy to pastes and inferior stones.
3. Anything that serves by contrast of color or quality to adorn or set off another thing to advantage.
As she a black silk cap on him beganSir P. Sidney.
To set, for foil of his milk-white to serve.
Hector has a foil to set him off.Broome.
4. A thin coat of tin, with quicksilver, laid on the back of a looking-glass, to cause reflection.
(Arch.) The space between the cusps in Gothic architecture; a rounded or leaflike ornament, in windows, niches, etc. A group of foils is called trefoil, quatrefoil, quinquefoil, etc., according to the number of arcs of which it is composed.
Foil stone, an imitation of a jewel or precious stone.
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Tue 11th December 2018